Abstract: A keyboard having ten elongate keys extending in a row substantially at right angles to a transverse centerline through the keys with each of the keys having a longitudinal trough on its upper surface defined by three recesses extending longitudinally of the key, with the sides of the recesses of adjacent edges of the fourth and fifth keys and of the sixth and seventh keys being reduced in height so as to facilitate movement of the index fingers from the fourth to the fifth key and from the seventh to the sixth key. Each of the elongate keys actuates three switches depending into which of the three recesses of the key a finger is applied, and the elongate key of one form of the invention is formed by a central relatively short auxiliary key and a long auxiliary key on its opposite ends, with these being articulated. Switch mechanism actuated by the key includes three plates in face-to-face contact.

Abstract: A keyboard for a typewriter or the like including a series of elongate keys disposed in a row and normally with respect to the front edge of the typewriter or at an acute angle with respect thereto. Each of the keys is depressable when a finger pressure is applied on the center, home tablet surface of the key for causing the typing action of a certain letter; the key is depressable when the finger is reached to a tablet surface adjacent to the upper edge of the key and the key is then depressed to cause the typing action for another letter; and the key likewise provides a typing action for still another letter when the finger is reached downwardly toward the lower edge of the key to a lower tablet surface and the key is then depressed.

Abstract: A single electron gun cathode ray tube for producing color pictures comprising three types of small bodies or beads affixed on the inner surface of the viewing end of the tube. The beads of the three types have phosphors associated with them to produce red, green and blue light respectively. A tuned tank circuit is associated with each bead and comprises opposite capacitor plates connected by an inductor extending through the bead for causing the bead and its phosphor to be excited at a certain frequency of electron flow from the electron gun of the tube, so that three different frequencies of electron flow cause the three different types of beads to produce red, green and blue light emissions respectively.